CN103114980B - Pumping stroke control method of double-cylinder pump and pumping device - Google Patents

Pumping stroke control method of double-cylinder pump and pumping device Download PDF

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Publication number
CN103114980B
CN103114980B CN201210213808.9A CN201210213808A CN103114980B CN 103114980 B CN103114980 B CN 103114980B CN 201210213808 A CN201210213808 A CN 201210213808A CN 103114980 B CN103114980 B CN 103114980B
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China
Prior art keywords
pumping stroke
pump
pumping
load pressure
cylinder pump
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CN103114980A (en
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裴杰
万梁
王佳茜
陈祺
化世阳
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Priority to CN201210213808.9A priority Critical patent/CN103114980B/en
Priority to PCT/CN2012/086118 priority patent/WO2014000388A1/en
Publication of CN103114980A publication Critical patent/CN103114980A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The invention discloses a pumping stroke control method of a double-cylinder pump. The pumping stroke control method of the double-cylinder pump comprises the following steps. Firstly, work load pressure of the double-cylinder pump is detected and obtained in the working process of the double-cylinder pump. Secondly, a target pumping stroke corresponding to the work load pressure is confirmed according to the work load pressure of the double-cylinder pump. Thirdly, an actual pumping stroke (L) of the double-cylinder pump is adjusted to the target pumping stroke by adjusting volume of hydraulic oil contained in a communication cavity (5) of the double-cylinder pump. In addition, the invention further provides a pumping device. According to the pumping stroke control method of the double-cylinder pump and the pumping device, the pumping stroke of the double-cylinder pump can be adjusted in an adapted mode according to work load pressure directly relevant to a pumping working station of the double-cylinder pump, the phenomenon of insufficient material suction of a material conveying cylinder is effectively avoided, pumping material suction efficiency is improved, and energy is saved. The pumping device is simple in structure, convenient to operate and low in cost.

Description

Pumping stroke controlling method and the pumping equipment of twin cylinder pump
Technical field
The present invention relates to a kind of pumping controlling method, particularly, relate to a kind of pumping stroke controlling method of twin cylinder pump.In addition the invention still further relates to, the pumping equipment of this pumping stroke controlling method of a kind of application.
Background technique
Mud, concrete, the materials such as mortar are engineerings, the structural material that building field is conventional, twin cylinder pump such as concrete pump (also referred to as " concrete pump " or " the concrete pump set ") is the engineering machinery extensively adopting in a kind of engineering construction, the main structure of this twin cylinder pump is similar with conventional for example concrete pump, it mainly utilizes pressure that fluid foods is carried continuously along pipeline, generally can drive oil hydraulic pump to form the hydraulic oil with certain pressure by motor (or internal-combustion engine), drive master cylinder to drive the piston in two concrete conveying cylinders to produce alternate reciprocating motion, make fluid foods constantly suck concrete conveying cylinder from hopper, be transported to job site by conveyance conduit.
In order to help to understand, below main structure and the shortcoming thereof of the described twin cylinder pump that makes brief of the introduction as an example of concrete pump example are simply described.
Particularly, concrete pump generally comprises two master cylinders (also referred to as " master hydraulic cylinder "), two concrete conveying cylinders (those skilled in the art are also referred to as " concrete cylinder "), two concrete pistons, two oscillating oil cylinders (i.e. common alleged " tilt cylinder "), hopper and distributing valve (for example S shape distributing valve), wherein the rodless cavity of two master cylinders is interconnected, rod chamber is connected to selector valve, this selector valve is connected in oil-feed oil circuit and fuel tank, optionally make the rod chamber of the first master cylinder in two master cylinders be communicated with oil-feed oil circuit by the commutation of described selector valve, the rod chamber of the second master cylinder is communicated with fuel tank, or the rod chamber of the first master cylinder is communicated with fuel tank, the rod chamber of the second master cylinder is communicated with oil-feed oil circuit.Because the rodless cavity of two master cylinders is interconnected and is closed with hydraulic oil, hydraulic oil in the rodless cavity of these two master cylinders plays the effect of driving medium, thereby can realize the alternately flexible of two master cylinders by the rod chamber oil-feed to two master cylinders alternately.Two concrete pistons lay respectively in described two concrete conveying cylinders and are connected with the piston rod of master cylinder respectively.In the time starting working, distributing valve is under the oil pressure actuated of pendulum valve oil cylinder, first move to primary importance, the material mouth of the first concrete conveying cylinder is communicated with concrete conveying pipe via distributing valve, the material mouth of the second concrete conveying cylinder is communicated with hopper entrance, now make hydraulic oil enter into the rod chamber of the second master cylinder, thereby the piston rod of the second master cylinder is retracted, the piston rod of the first master cylinder stretches out, the piston rod of this first master cylinder promotes the concrete piston in the first concrete conveying cylinder, thereby the concrete in the first concrete conveying cylinder is gone out by distributing valve pumping, the piston rod of the second master cylinder is retracted and is driven the concrete piston in the second concrete conveying cylinder to retract simultaneously, thereby form vacuum in the second concrete conveying cylinder, and concrete is drawn in the second concrete conveying cylinder from hopper, constantly alternation is to realize concrete uninterrupted pumping and so forth.It should be noted that at this, two master cylinders are not limited to above-mentioned rodless cavity and are interconnected to form the situation of communicated cavity, selectively, the rod chamber that also can adopt two master cylinders is interconnected and forms the structural type of communicated cavity, and the rodless cavity of two master cylinders forms actuator chamber respectively and is connected with selector valve in this case.
But, the concrete pumping of above-mentioned prior art substantially all adopts fixed journey system to carry out pumping to concrete, in actual use, due to the difference of the material condition parameters such as the concrete viscosity of different work process medium fluid, slump, when the concrete pump of employing fixed journey system carries out pumping, under a lot of operating modes there is the phenomenon of suction deficiency in concrete conveying cylinder, but master cylinder and concrete conveying cylinder still according to fixing stroke action, this has greatly reduced the pumping efficiency of concrete pump.
In addition, at present also there is technician to propose in the pumping control of concrete pump, detect in real time the displacement of master cylinder, concrete conveying cylinder and oscillating oil cylinder etc., by the displacement signal of real-time detection oil cylinder, to realize the accurate control to master cylinder commutation, oscillating oil cylinder commutation, oil pump capacity, optimization system performance, improves control accuracy.But this control mode is only to optimize the overall work performance of concrete pump, and control complexity, thereby cause the problem of pumping efficiency reduction not pointed for concrete conveying cylinder because concrete material condition difference exists suction deficiency.
From upper description, the major defect of the concrete pump of prior art is: described concrete pump is in the time of the fluid concrete of the different material of pumping condition parameter, under some operating modes, can there is the phenomenon of concrete conveying cylinder suction deficiency, but in concrete pump, there is not corresponding concrete pumping condition detector, cannot realize the automatic detection function of operating mode, master cylinder and concrete conveying cylinder are still according to one or both fixing stroke action, thereby cause concrete pumping efficiency low, energy waste is large, cause under the specific concrete operating mode of minority pumping suction efficiency more excellent, the working state that other operating mode all reduces in pumping efficiency.
Below be only to have described the shortcoming that concrete pump exists in the time of pump concrete as an example of concrete pump example, but apparently, similarly other twin cylinder pump is same when the relevant fluid foods of pumping an above-mentioned shortcoming with concrete pump structure.In view of this, need to design a kind of pumping controlling method and pumping equipment of novel twin cylinder pump.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of pumping stroke controlling method of twin cylinder pump, by this pumping stroke controlling method, can under the different pumping operating mode of twin cylinder pump, select relatively suitable pumping stroke, thus optimize twin cylinder pump pumping efficiency.
Further, technical problem to be solved by this invention is to provide a kind of pumping stroke controlling method of twin cylinder pump, the pumping stroke controlling method of this twin cylinder pump can in the pumpdown process of twin cylinder pump, automatically regulate adaptively twin cylinder pump pumping stroke, thereby optimize twin cylinder pump pumping efficiency.
In addition, technical problem to be solved by this invention is to provide a kind of pumping equipment, this pumping equipment can in the pumpdown process of twin cylinder pump, automatically regulate adaptively twin cylinder pump pumping stroke, thereby optimize twin cylinder pump pumping efficiency.
In order to solve the problems of the technologies described above, the invention provides a kind of pumping stroke controlling method of twin cylinder pump, wherein, comprise the steps: the first, in twin cylinder pump working procedure, detect and obtain the operating load pressure of this twin cylinder pump; The second, determine according to the operating load pressure of described twin cylinder pump the target pumping stroke that this operating load pressure is corresponding; The 3rd, by regulating the volume of the hydraulic oil holding in the communicated cavity of described twin cylinder pump, and the actual pumping stroke of described twin cylinder pump is adjusted to described target pumping stroke.Selectively, in described first step, the operating load pressure of described concrete pump is suction induced pressure, stock induced pressure or total load pressure.
Particularly, in described first step, the operating load pressure of described twin cylinder pump is suction induced pressure, stock induced pressure or total load pressure.
Particularly, in described first step, the operating load pressure of described twin cylinder pump is total load pressure, by detecting driving oil pressure in the first working oil path or second working oil path of described twin cylinder pump to determine described total load pressure.
Particularly, in described first step, the operating load pressure of described twin cylinder pump is stock induced pressure, by detecting oil pressure in described communicated cavity to determine described stock induced pressure.
Particularly, in described first step, in described first step, the operating load pressure of described twin cylinder pump is suction induced pressure, by detecting driving oil pressure in the first working oil path or second working oil path of described twin cylinder pump to determine described total load pressure, and by detecting oil pressure in described communicated cavity to determine described stock induced pressure, and then determine described suction induced pressure by calculating the difference of this total load pressure and described stock induced pressure.
Preferably, in described second step, determine described target pumping stroke according to detecting the described operating load pressure obtaining by Query Database or data sheet.
Selectively, in described third step, the initial described actual pumping stroke of work of described twin cylinder pump is adjusted in maximum pumping stroke, makes described actual pumping stroke increase to described target pumping stroke by reducing the volume of the hydraulic oil in described communicated cavity.
Preferably, in described third step, detect the described actual pumping stroke of described twin cylinder pump, in the time that this actual pumping stroke is greater than described target pumping stroke, make described actual pumping stroke be reduced to described target pumping stroke by increasing the volume of the hydraulic oil in described communicated cavity; In the time that described actual pumping stroke is less than described target pumping stroke, make described actual pumping stroke increase to described target pumping stroke by reducing the volume of the hydraulic oil in described communicated cavity.
Specifically selectively, in described third step, regulate continuously the volume of the hydraulic oil in described communicated cavity, and detect in real time the actual pumping stroke of described twin cylinder pump, until being adjusted to described target pumping stroke, this actual pumping stroke stops regulating the volume of the hydraulic oil in described communicated cavity.
Selectively in described third step, the volume of the hydraulic oil increasing in described communicated cavity or reduce is the sectional area that the absolute value of the difference of described actual pumping stroke and described target pumping stroke is multiplied by described communicated cavity, wherein, in the time that described communicated cavity is formed by the first master cylinder of described twin cylinder pump and the connection of the rodless cavity of the second master cylinder, the sectional area of described communicated cavity equals the sectional area of the rodless cavity of described the first master cylinder or the second master cylinder; When described communicated cavity is communicated with while forming by the rod chamber of described the first master cylinder and the second master cylinder, the sectional area that the sectional area of described communicated cavity equals the rod chamber of described the first master cylinder or the second master cylinder deducts the sectional area of the piston rod of this first master cylinder or the second master cylinder.
Further, the pumping stroke controlling method of described twin cylinder pump also comprises the 4th step, in the 4th step, detects the actual pumping stroke after described twin cylinder pump regulates, to determine that the actual pumping stroke after this adjusting equals described target pumping stroke.
Most preferably, in described first step, detect and obtain the operating load pressure of described twin cylinder pump by operating load pressure-detecting device; In described second step, adopt controller according to detecting the described operating load pressure obtaining, determine the corresponding described target pumping stroke of this operating load pressure by the database of inquiring about in this controller; In described third step, described controller control pumping stroke controlling device, to regulate the volume of the hydraulic oil in described communicated cavity by this pumping stroke controlling device.
In addition, the present invention also provides a kind of pumping equipment, comprise twin cylinder pump, wherein, this pumping equipment also comprises controller, for regulating the pumping stroke controlling device of the hydraulic oil volume in the communicated cavity of described twin cylinder pump, and for detection of the operating load pressure-detecting device of the operating load pressure of described twin cylinder pump, described controller is electrically connected on described operating load pressure-detecting device and described pumping stroke controlling device, the described operating load pressure that this controller is determined according to detection is determined the target pumping stroke of the corresponding twin cylinder pump of this operating load pressure, and and then regulate the volume of the hydraulic oil holding in the communicated cavity of described twin cylinder pump by controlling described pumping stroke controlling device, thereby actual pumping stroke current described twin cylinder pump is adjusted to described target pumping stroke.
Particularly, described operating load pressure-detecting device comprises oil pressure sensor, this operating load pressure-detecting device is communicated with described the first working oil path and the second working oil path respectively by hydraulic pipe line, and/or this operating load pressure-detecting device is communicated with described communicated cavity by hydraulic pipe line.
Typically, described pumping stroke controlling device comprises the drive unit of pump suction device and this pump suction device, described controller is electrically connected on described drive unit, and described pump is inhaled device and is communicated with the communicated cavity of described twin cylinder pump with optionally from aspirating in this communicated cavity or to injection liquid force feed in this communicated cavity.
Particularly, it is metering pump that described pump is inhaled device, and described drive unit is motor.
Preferably, described pumping equipment also comprises the displacement transducer for detection of the actual pumping stroke of described twin cylinder pump.
Particularly, described displacement transducer is magnetic resistance type linear displacement transducer.
Specifically selectively, described pumping equipment is concrete pumping equipment.
Pass through technique scheme, pumping stroke controlling method and the pumping equipment of twin cylinder pump of the present invention, can be according to the operating load pressure of the fluid foods of institute's pumping, regulate adaptively the pumping stroke of twin cylinder pump, make mass transport cylinder (for example concrete conveying cylinder) effectively avoid the phenomenon of suction deficiency, thereby improve pumping suction efficiency, energy saving.Especially, under preferred form of the present invention, the present invention preferably adopts operating load pressure-detecting device, has controller and the pumping stroke controlling device of database, realize automatically and regulating by controller, thereby realized twin cylinder pump the self adaption of pumping stroke regulate.Therefore, the present invention can make twin cylinder pump under different pumping operating modes with the pumping stroke work of relative ideal, thereby reached desirable suction efficiency.In addition, pumping equipment of the present invention is simple in structure, easy to operate, and owing to effectively having reduced the backlash of conveyor piston, therefore can extend significantly the life-span of conveyor piston.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Brief description of the drawings
Following accompanying drawing is used to provide a further understanding of the present invention, and forms the part of specification, and itself and following embodiment one are used from explanation the present invention, but protection scope of the present invention is not limited to following the drawings and the specific embodiments.In the accompanying drawings:
Fig. 1 is the sectional structure schematic diagram of the disclosed concrete pump of Chinese utility model patent CN201486790U of the prior art.
Fig. 2 is U.S. patent of invention US6 of the prior art, the hydraulic principle schematic diagram of the disclosed fluid power proportioning pump of 422,840B2.
Fig. 3 is the structural principle schematic diagram of the pumping equipment of the specific embodiment of the invention, wherein shows as an example of concrete pumping equipment example.
Fig. 4 is the FB(flow block) of the pumping stroke controlling method of the twin cylinder pump of the preferred embodiment for the present invention, wherein shows as an example of the pumping stroke control of concrete pump example.
Description of reference numerals:
1 first master cylinder; 2 second master cylinders;
3 first piston bars; 4 second piston rods;
5 communicated cavitys; 6 first piston bar displacement transducers;
7 second piston rod displacement transducers; 8 pumping stroke controlling devices;
9 controllers; 10 total load pressure-detecting devices;
11 first concrete conveying cylinders; 12 second concrete conveying cylinders;
13 first concrete pistons; 14 second concrete pistons;
The actual pumping stroke of L.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, should be understood that, embodiment described herein is only for description and interpretation the present invention, and protection scope of the present invention is not limited to following embodiment.
In order to make, the description of embodiment is more clear and definite specifically it will be appreciated by those skilled in the art that following pumping stroke controlling method and the pumping equipment of mainly describing twin cylinder pump of the present invention as an example of concrete pump example to facilitate.Correspondingly, in the following description, the pumping stroke controlling method of twin cylinder pump is called " the pumping stroke controlling method of concrete pump " pointedly, pumping equipment is called " concrete pumping equipment " pointedly, but for those skilled in the art apparently, because main structure and the concrete pump structure of twin cylinder pump of the present invention are similar, following embodiment can be applicable to generality the control of the pumping stroke of fluid foods twin cylinder pump, the such as control of the pumping stroke of the twin cylinder pump such as mud, mortar.
Before describing the specific embodiment of the present invention, in order to understand more fully the following technological scheme of the present invention, need to first illustrate:
The first, known ground, the concrete of concrete pump pumping is fluid concrete, therefore, in the application's technological scheme, " concrete " refers to pass through the fluid concrete of concrete pump pumping, and is not the concrete of solid state;
Second, in the process of concrete pump pump concrete, such as, due to the difference of concrete material condition parameter (viscosity, slump, water content, sand content) in different work etc., usually there is the phenomenon of suction deficiency in the concrete conveying cylinder of concrete pump, the total load pressure of concrete pump is also different, and this will suitably describe in detail in principle introduction below;
The 3rd, know for those skilled in the art about the structural type of concrete pump itself, make brief of the introduction hereinbefore, therefore in the description of technological scheme of the present invention below, to omit the introduction of known features, and stress key technology design of the present invention.For example, although show in Fig. 3 of the present invention that the rodless cavity of the first master cylinder 1 and the second master cylinder 2 is interconnected to form communicated cavity 5, and the rod chamber of the first master cylinder 1 and the second master cylinder 2 is connected in oil-feed oil circuit and fuel tank by the first working oil path A and the second working oil path B via selector valve respectively, thereby form flexible commutation control loop (only schematically illustrating the first working oil path A and the second working oil path B in Fig. 3), but selectively, also the rod chamber that can say the first master cylinder 1 and the second master cylinder 2 is interconnected to form communicated cavity 5, and the rodless cavity of the first master cylinder 1 and the second master cylinder 2 is connected to the first working oil path A and the second working oil path B, these simple variant all should be worked as and belong to protection scope of the present invention.In addition, in Fig. 3, omitted some other well-known components of concrete pump, for example distributing valve of concrete conveying cylinder 11,12 delivery ends settings, swing cylinder, hopper etc., but do not affect the understanding of those skilled in the art to technical solution of the present invention.
First the embodiment of the pumping stroke controlling method of concrete pump of the present invention is below described, and then the embodiment of concrete pumping equipment of the present invention described, in description process, by subsidiary typical concrete device and some possible simple deformation forms of describing operating process of the present invention, adopting.
The major technique design of the pumping stroke controlling method of concrete pump of the present invention is: according to the operating load pressure of concrete pump (it is directly related with the actual suction situation of concrete pump), and determine suitable target pumping stroke according to this operating load pressure, and then by the amount (being volume) that regulates the hydraulic oil in communicated cavity 5, the actual pumping stroke L of concrete pump is adjusted to described target pumping stroke.
The design of above-mentioned major technique relates to the operating load pressure of concrete pump and by regulating the amount (being volume) of the hydraulic oil in communicated cavity 5 by the know-why of the actual pumping stroke L of concrete pump, specifically principle and being analyzed as follows.
With regard to the operating load pressure of concrete pump, shown in Figure 3, described above, in the operation process of concrete pump, pusher and the suction action that hockets of the first concrete conveying cylinder 11 and the second concrete conveying cylinder 12, in the time of the first concrete conveying cylinder 11 pusher, the second concrete conveying cylinder 12 suctions, vice versa.Correspondingly, the operating load pressure of concrete pump can be subdivided into total load pressure, suction induced pressure and stock induced pressure, wherein total load pressure equals suction induced pressure and stock induced pressure sum, and suction induced pressure and stock induced pressure equate or are substantially equal, it should be noted that at this, due to the symmetry properties of the agent structure of concrete pump, if there is the phenomenon of suction deficiency in operation process, substantially be the phenomenon that two concrete conveying cylinders all exist suction deficiency, technological scheme of the present invention can adopt above-mentioned total load pressure, suction induced pressure or stock induced pressure are as the reference data of determining target pumping stroke, this does not affect the validity of technical solution of the present invention.
Particularly, if ignore in theory the first and second master cylinders 1,2 and first and second concrete pistons 13, the impact of 14 self friction power, total load pressure should equal that concrete pump forms in suction side for aspirate concrete suction and form at exit side for promoting concrete thrust sum (the first concrete conveying cylinder 11 and the second concrete conveying cylinder 12 are alternately as suction side or the exit side of concrete pump).In actual job process, the pump of concrete pump is inhaled the impact that induced pressure also needs to consider the frictional force between each piston and corresponding cylinder body.Certainly, total load pressure, the detection of suction induced pressure or stock induced pressure is not difficult, because the pump suction driving force of concrete pump comes from the first working oil path A and the second alternately oil-feed of working oil path B, pump is inhaled driving force and is depended on or equal induced pressure, therefore detect oil pressure by oil pressure sensor and can easily obtain total load pressure, hydraulic oil in communicated cavity 5 is mainly used in driving the first master cylinder 1 or the second master cylinder 2 to drive the first concrete piston 13 or the second concrete piston 14 pushers simultaneously, therefore can easily obtain concrete pusher pressure by oil pressure sensor, concrete pusher induced pressure equals suction induced pressure substantially, certainly more accurately, can obtain suction induced pressure by making total load pressure deduct concrete pusher induced pressure.
For example, in Fig. 3, drive the first concrete conveying cylinder 11 suctions when the first working oil path A oil-feed, when the second concrete conveying cylinder 12 discharging, by the oil pressure on the first working oil path A being communicated with the rod chamber of the first master cylinder 1 (in Fig. 3 as actuator chamber) being detected, this oil pressure is multiplied by the net sectional area (sectional area of rod chamber deducts the sectional area of the bar portion of first piston bar 2) of the rod chamber of the first master cylinder 1, can obtain total load pressure, by detecting the oil pressure in communicated cavity 5, the sectional area that oil pressure in this communicated cavity 5 is multiplied by the rodless cavity of the first master cylinder 1 or the second master cylinder 2 can obtain stock induced pressure, this concrete pusher induced pressure equals suction induced pressure substantially, can certainly obtain suction induced pressure by making total load pressure deduct concrete pusher induced pressure.In addition, if the rod chamber of the first master cylinder 1 and the second master cylinder 2 is interconnected as communicated cavity 5 in Fig. 3, and the rodless cavity of the first master cylinder 1 and the second master cylinder 2 is communicated with the first working oil path A and the second working oil path B respectively and as actuator chamber, in this case, the situation that detects total load pressure, suction induced pressure and stock induced pressure is similarly, but the sectional area that oil pressure is taken advantage of when computational load pressure needs corresponding change.
Apparently, if make concrete pump have the phenomenon of suction deficiency because concrete material shape parameter to be conveyed is different in concrete pump operation process, and there is the phenomenon of suction deficiency in various degree for the concrete of difference material shape parameter, the concrete amount difference of inhaling due to pump in different operation process due to concrete pump, the coagulation pump forming is thus inhaled induced pressure, stock induced pressure and suction induced pressure are also different, be that coagulation pump is inhaled induced pressure, stock induced pressure and suction induced pressure are actual directly related with suction or the stock actual conditions of concrete pump, if for example coagulation pump is inhaled induced pressure, stock induced pressure and suction induced pressure are less, representing the suction deficiency of concrete pump, now for fear of the invalid idle stroke of master cylinder, can suitably turn the pumping stroke of concrete pump down.This can set up a database or data sheet by a large amount of simulated condition tests, inhale induced pressure, stock induced pressure and dreamboat pumping stroke corresponding different under suction induced pressure at the coagulation pump of each numerical value, if the actual pumping stroke of concrete pump equals this target pumping stroke, can effectively avoid idle stroke, improve pumping efficiency.Owing to having fixing numerical relation between the suction of coagulation pump induced pressure, stock induced pressure and suction induced pressure, for the work of setting up in reduced data storehouse, generally can inhale any in induced pressure, stock induced pressure and suction induced pressure as the benchmark corresponding to different target pumping stroke using coagulation pump, most preferably, can be using suction induced pressure as benchmark.
With regard to the amount (being volume) by regulating the hydraulic oil in communicated cavity 5 by with regard to the know-why of the actual pumping stroke L of concrete pump, shown in Figure 3, hydraulic oil has incompressibility in theory, for the concrete of various concrete models, the first concrete piston 13 and the second concrete piston 14 propelling position in the first concrete conveying cylinder 11 and the second concrete conveying cylinder 12 is fixed, for example, under the situation shown in Fig. 3, the first working oil path A oil-feed, the second working oil path B oil return, thereby promote the first piston bar 3 of the first master cylinder 1 to left movement, first piston bar 3 drives the first concrete piston 13 in the first concrete conveying cylinder 11 to left movement, because first piston bar 3 is to left movement, thereby compression is as the hydraulic oil in the rodless cavity (forming the constituent element of communicated cavity 5) of the first master cylinder 1, make running of hydraulic power oil in the rodless cavity of this first master cylinder 1 in the rodless cavity of the second master cylinder 2, thereby the second piston rod 4 that promotes the second master cylinder 2 moves right, the second piston rod 4 promotes the second concrete piston 14 and moves right, in Fig. 3, the second concrete piston 14 has moved the propelling final position of the second concrete conveying cylinder 14 right-hand members (for fear of hitting cylinder, corresponding limit stops right-hand member general and this concrete conveying cylinder on concrete conveying cylinder has predetermined interval), although now first piston bar 3 still moves and puts in place left in the first master cylinder 1, the first concrete piston 13 does not move to the left end suction final position of the first concrete cylinder 11 in the first concrete conveying cylinder 11 yet accordingly, but because the second concrete piston 14 has moved and put in place, it cannot continue to move right again, due to the incompressibility of the hydraulic oil in inhibition and the communicated cavity 5 of the second concrete piston 14, no matter whether the first working oil path A continues oil-feed, all cannot promote first piston bar 3 continues to left movement.Move right under the situation putting in place at the second concrete piston 14 shown in Fig. 3, carry out switch operation, make the second working oil path B oil-feed, and the first working oil path A oil return, the second piston rod 4 is also merely able to the distance from illustrated position to the actual pumping stroke L of left movement, the right-hand member that just the first concrete piston 13 can be driven into the first concrete conveying cylinder 11 advances (known ground, final position, in order to ensure matching and the conformity of pumping stroke, the first and second master cylinders 1 of concrete pump, the 2nd, identical oil hydraulic cylinder, the first concrete conveying cylinder and the second concrete conveying cylinder 11, 12 is also identical conveying cylinder, and in agent structure, be symmetrical arranged), that is to say, in this case, the actual pumping stroke of concrete pump is L, it should be noted that, the actual pumping stroke L of concrete pump equals the first piston bar 3(of the first master cylinder 1 or the second piston rod 4 of the second master cylinder 2) fore and aft motion stroke and the first concrete piston 13(of the first concrete conveying cylinder 11 or the second concrete piston 14 of the second concrete conveying cylinder 12) fore and aft motion stroke, therefore control the first piston bar 3(of the first master cylinder 1 or the second piston rod 4 of the second master cylinder 2) change of fore and aft motion stroke, also just mean the change of the actual pumping stroke L of concrete pump.
Under the state shown in Fig. 3, (carry out static analysis herein for ease of understanding), if the hydraulic oil by pumping stroke controlling device 8 to the interior increase predetermined of communicated cavity 5 V, now the second piston rod 4 of the second master cylinder 2 puts in place because the second concrete piston 14 has moved and cannot make the rodless cavity enlarging volume of the second master cylinder 2, now the hydraulic oil of this predetermined V can only increase by promoting the first piston bar 3 of the first master cylinder 1 to the right the volume of the rodless cavity of the first master cylinder 1, under the state of Fig. 3, first piston bar 3 moves right, actual pumping stroke L just can reduce that (distance reducing is that the predetermined V of the hydraulic oil that increases is divided by the sectional area of the rodless cavity of the first oil hydraulic cylinder, certainly form under the situation of communicated cavity 5 at rod chamber, the predetermined V of the hydraulic oil increasing should be divided by the rod chamber sectional area of the first oil hydraulic cylinder that has deducted piston rod sectional area), accordingly, if by pumping stroke controlling device 8 from reducing the hydraulic oil of predetermined V in communicated cavity, first piston bar 3 can be moved to the left from the position shown in Fig. 3, thereby actual pumping stroke L is increased.Although above-mentioned analysis is only static analysis for ease of understanding, but no matter dynamically still static, its principle is identical, in the pumping procedure of concrete pump, can be by changing the volume (because the incompressibility of hydraulic oil also changes the volume of communicated cavity 5) of the hydraulic oil in communicated cavity 5, can control the size of the piston rod fore and aft motion stroke of master cylinder, correspondingly also just change the actual pumping stroke L of concrete pump, particularly, if the hydraulic oil total volume in communicated cavity 5 reduces, the fore and aft motion stroke of master cylinder (the first master cylinder 1 and the second master cylinder 2) becomes large, the actual pumping stroke L of concrete pump increases, if the hydraulic oil total volume in communicated cavity 5 increases, the fore and aft motion stroke of master cylinder diminishes, and the pumping stroke L of concrete pump reduces.Therefore, by controlling the amount (being the volume of hydraulic oil) of the hydraulic oil in communicated cavity, can realize the control of the fore and aft motion formation of master cylinder, thereby realize the step-less adjustment of the pumping stroke of concrete pump.Annotated at this, step-less adjustment of the present invention, refers to that concrete pump can be adjusted to the pumping stroke of multiple pumping stroke or basic continous.
Shown in Figure 4, the pumping stroke controlling method of concrete pump of the present invention comprises the steps:
The first, in concrete pump working procedure, detect and obtain the operating load pressure of concrete pump; The second, determine the target pumping stroke that this operating load pressure is corresponding (generally testing determined database or data sheet is determined by contrast via simulated condition) according to the operating load pressure of described concrete pump; The 3rd, by regulating the volume of the hydraulic oil holding in the communicated cavity 5 of described concrete pump, and the actual pumping stroke L of described concrete pump is adjusted to described target pumping stroke.
It should be noted that at this; although thereby the pumping stroke controlling method of concrete pump of the present invention preferably adopts automatic control to form a kind of pumping stroke controlling method of self-adapting type concrete pump; but the pumping stroke controlling method of concrete pump of the present invention also can adopt the mode of manual tune control to realize to above-mentioned each step; although it does not have advantages of automatic adjusting, it belongs to protection scope of the present invention equally.
Within the scope of the above-mentioned major technique design of the pumping stroke controlling method of concrete pump of the present invention, with regard to above-mentioned first step, as described above, the operating load pressure of described concrete pump can be suction induced pressure, stock induced pressure or total load pressure.Certainly, also can adopt two or three benchmark as definite target pumping stroke in suction induced pressure, stock induced pressure and total load pressure simultaneously, but can make like this relative complex of setting up of database.About detection and the Computing Principle of suction induced pressure, stock induced pressure or total load pressure are being described, do not repeat them here.Shown in Figure 3, the present invention mainly adopts operating load pressure-detecting device to detect, this operating load pressure-detecting device is mainly oil pressure sensor, when adopting total load pressure when determining the benchmark of target pumping stroke, but this operating load pressure-detecting device 10 is connected to the first working oil path A being communicated with the rod chamber of the first master cylinder 1 and on the second working oil path B being communicated with the rod chamber of the second master cylinder 2, thereby the oil pressure that drives hydraulic oil in the time that replacing oil-feed, the first working oil path A and the second working oil path B all can be detected, can calculate (preferably this oil pressure is transported in controller 9) according to this oil pressure and go out total load pressure, it should be noted that at this, Fig. 3 is only that the rodless cavity of the first master cylinder 1 and the second master cylinder 2 is interconnected and forms the situation of communicated cavity 5, concrete pump also exists the rod chamber of the first master cylinder 1 and the second master cylinder 2 to be interconnected to form the situation of communicated cavity 5, now the first working oil path A is communicated with the rodless cavity of the first master cylinder, the second working oil path B is communicated with the rodless cavity of the second master cylinder 2, but detecting method is identical.Therefore, in general, when adopting total load pressure when determining the benchmark of target pumping stroke, this operating load pressure-detecting device 10 can be communicated with the first working oil path A and the second working oil path B of described concrete pump, to detect the driving oil pressure of concrete pump, and calculate and obtain total load pressure by this driving oil pressure.When adopting stock induced pressure when determining the benchmark of target pumping stroke, but this operating load pressure-detecting device 10 is communicated with the communicated cavity 5 of concrete pump, thereby detect and detect the oil pressure obtaining in communicated cavity 5, and calculate and obtain stock induced pressure with this oil pressure.When adopting suction induced pressure when determining the benchmark of target pumping stroke, described operating load pressure-detecting device 10 can comprise two oil pressure sensors, one of them oil pressure sensor is communicated with the first working oil path A and the second working oil path B respectively, another oil pressure sensor is communicated with communicated cavity 5, can calculate respectively like this total load pressure and stock induced pressure, the difference of this total load pressure and stock induced pressure is suction induced pressure.It should be noted that at this, the form that specifically arranges of operating load pressure-detecting device 10 is diversified for the technician of Hydraulic Field, be not limited to the concrete situation shown in Fig. 3, in Fig. 3, be for example by the first working oil path A by oil circuit, hydraulic oil in two working oil path B and communicated cavity 5 is measured after drawing, but apparently, oil pressure sensor in operating load pressure-detecting device 10 also can directly be set in communicated cavity 5 or in the rod chamber of the first master cylinder 1 shown in Fig. 3 and the rod chamber of the second master cylinder 2, and oil pressure sensor can be electrically connected on following controller 9, thereby calculated according to corresponding oil pressure by controller and determine corresponding suction induced pressure, stock induced pressure or total load pressure, certainly operating load pressure-detecting device 10 also can carry corresponding computing unit and display unit, thereby can determine and/or show required operating load pressure.
In addition, in above-mentioned second step, preferably can determine by controller 9 the target pumping stroke of the concrete pump that this operating load pressure is corresponding according to any operating load pressure of above-mentioned concrete pump, can be input in controller 9 by above-mentioned any operating load pressure that detects definite concrete pump, the corresponding oil pressure that can certainly detect is directly transferred to controller 9, by the corresponding operating load pressure of controller 9 calculative determination, in this controller 9, there is database, in this database, store the corresponding target pumping stroke of described operating load pressure of each numerical value, controller 9 is according to described operating load pressure, find the corresponding target pumping stroke of this operating load pressure by Query Database, thereby determine the corresponding target pumping stroke of described operating load pressure.Described controller 9(also can become pumping stroke adaptive controller) can adopt ECU (Electrical Control Unit), programmable controller, single-chip microcomputer etc.Certainly, be also not limited to the form of the automatic inquiry that adopts controller 9, also can determine target pumping stroke according to the operating load pressure contrasting data table of the corresponding concrete pump of determining by operator.Desirable or the most more satisfactory pumping stroke of concrete that the corresponding target pumping stroke of concrete of the operating load pressure of different numerical value is generally this operating load pressure, in the time that concrete pump adopts this target pumping stroke to carry out the concrete pumping of this material condition, concrete conveying cylinder is not easy to occur the phenomenon of suction deficiency, thereby has relatively high pumping efficiency.The foundation of database is mainly tested by simulated condition, sum up the target pumping stroke of the concrete pump of the operating load pressure (for example suction induced pressure, stock induced pressure or total load pressure) of various concrete pumps, thereby and make the operating load pressure of corresponding concrete pump there is corresponding target pumping stroke.For example, with regard to the concrete pump of a certain model, determine the target pumping stroke corresponding to various operating load pressure of this concrete pump by a large amount of simulated condition tests.
In above-mentioned third step, particularly, can detect the current actual pumping stroke L of described concrete pump, this can for example, realize by linear displacement transducer (magnetic resistance linear displacement transducer), in the time that actual pumping stroke L is greater than described target pumping stroke, can make described actual pumping stroke L be reduced to described target pumping stroke by increasing the volume of the hydraulic oil in described communicated cavity 5.In the time that actual pumping stroke L is less than described target pumping stroke, can make described actual pumping stroke L increase to described target pumping stroke by reducing the volume of the hydraulic oil in described communicated cavity 5.Adjustment process can be taked multiple adjusting order particularly, for example can regulate continuously by pumping stroke controlling device the volume of the hydraulic oil in described communicated cavity 5, preferably can adopt metering pump continuously to the interior injection of communicated cavity 5 or from communicated cavity 5 Extract force feeds, and detect in real time the actual pumping stroke L of described concrete pump, until being adjusted to target pumping stroke, actual pumping stroke L stops regulating the volume of the hydraulic oil in communicated cavity 5.Certainly, the most simply, also can be before every subjob of concrete pump, the actual pumping stroke L of concrete pump is adjusted to maximum pumping stroke, thereby regulate to target pumping stroke as actual pumping stroke L using this maximum pumping stroke, before regulating, can not detect in this case the current actual pumping stroke of concrete pump.
Most preferably, because communicated cavity 5 is to be communicated with and to be formed by the rodless cavity of the first master cylinder 1 and the second master cylinder 2, or be communicated with and form by the rod chamber of the first master cylinder 1 and the second master cylinder 2, the sectional area that is communicated cavity 5 is determined, therefore most preferably, can be first calculate according to target pumping stroke and actual pumping stroke L the volume that needs the hydraulic oil that increases or reduce, then by metering pump to the interior injection liquid force feed of described communicated cavity 5 or regulate the volume of the hydraulic oil in communicated cavity 5 from the interior Extract force feed of this communicated cavity 5.Particularly, known by above-mentioned principle analysis, the volume of the hydraulic oil of the interior injection of described communicated cavity 5 or extraction is the sectional area that the absolute value of the difference of actual pumping stroke L and target pumping stroke is multiplied by communicated cavity 5, wherein, in the time that communicated cavity 5 is formed by the first master cylinder 1 of concrete pump and the connection of the rodless cavity of the second master cylinder 2, the sectional area of communicated cavity 5 equals the sectional area of the rodless cavity of the first master cylinder 1 or the second master cylinder 2; When communicated cavity 5 is communicated with while forming by the rod chamber of the first master cylinder 1 and the second master cylinder 2, the sectional area that the sectional area of communicated cavity 5 equals the rod chamber of the first master cylinder 1 or the second master cylinder 2 deducts the sectional area of the piston rod 3 or 4 of this first master cylinder 1 or the second master cylinder 2.
When by metering pump, the hydraulic oil of above-mentioned volume being increased as required or reducing to communicated cavity 5 when interior, just can ensure the actual pumping stroke L of concrete pump to be adjusted to target pumping stroke.Further preferably, whether accurate in order to verify adjusting, can also detect further the actual pumping stroke of concrete pump, and determine whether the actual pumping stroke after regulating equals target pumping stroke, thereby determine whether to need further to regulate.
From upper description, the pumping stroke controlling method of concrete pump of the present invention preferably can set the best of the operating load pressure based on concrete pump or the target pumping stroke database of better suction efficiency under self adaptive control form in controller, and the operating load pressure of every kind of corresponding concrete pump will have a corresponding target pumping stroke; In pump concrete process, the operating load pressure of detection definite concrete pump, and then by controller will be in above-mentioned database query aim pumping stroke, controller is according to the target pumping stroke of inquiry, control pumping stroke controlling device, regulate the extension and contraction control stroke of master cylinder, for example, until the actual pumping stroke of displacement transducer feedback while being target pumping stroke, stroke adjustment finishes.When pumping, concrete pump will carry out pumping with this target pumping stroke, and concrete conveying cylinder will reach desirable suction efficiency.That is to say, key technology point of the present invention is: the first, be provided with the operating load pressure-detecting device of concrete pump, and can in concrete pump working procedure, detect adaptively the operating load pressure of concrete pump; The second, be provided with the database of the target pumping stroke under the operating load pressure of various concrete pumps, can realize the desirable suction efficiency in concrete conveying cylinder according to target pumping stroke.Second, be provided with pumping stroke controlling device, can regulate by pumping stroke controlling device the volume of the hydraulic oil in communicated cavity 5, thereby can regulate as required pumping stroke, thereby realized step-less adjustment pumping stroke, the self adaption that has realized concrete pump pumping stroke under especially most preferred form of implementation regulates automatically.
The embodiment of the simple concrete pumping equipment of describing the pumping stroke controlling method that can realize above-mentioned concrete pump of the present invention below.Shown in Figure 3, concrete pumping equipment of the present invention comprises concrete pump, wherein, this concrete pumping equipment also comprises controller 9, for regulating the pumping stroke controlling device 8 of the hydraulic oil volume in the communicated cavity 5 of described concrete pump, and for detection of the operating load pressure-detecting device 10 of the operating load pressure of described concrete pump, described controller 9 is electrically connected on described operating load pressure-detecting device 10 and described pumping stroke controlling device 8, the described operating load pressure that this controller 9 is determined according to detection is determined the target pumping stroke of the corresponding concrete pump of this operating load pressure, and and then regulate the volume of the hydraulic oil holding in the communicated cavity 5 of described concrete pump by controlling described pumping stroke controlling device 8, thereby actual pumping stroke L current described concrete pump is adjusted to described target pumping stroke.
In the technological scheme of above-mentioned concrete pumping equipment, it will be appreciated that, as described in above-mentioned controlling method, be maximum pumping stroke because the present invention can make the initial pumping stroke of concrete pump before the pumping stroke that regulates concrete pump, and after definite target pumping stroke, can calculate by controller need to be from the volume of the hydraulic oil of communicated cavity 5 interior minimizings, therefore displacement transducer (for example first piston bar displacement transducer 6 and the second piston rod displacement transducer 7) does not belong to that concrete pumping equipment of the present invention must comprise, if certainly need to realize in operation process continuously and regulating, preferably should comprise displacement transducer, refer to following.
Described operating load pressure-detecting device 10 generally can comprise oil pressure sensor, this operating load pressure-detecting device 10 distinguishes described the first working oil path A by hydraulic pipe line and the second working oil path B is communicated with, and/or this operating load pressure-detecting device 10 is communicated with described communicated cavity 5 by hydraulic pipe line.As mentioned above, selecting to adopt suction induced pressure, stock induced pressure or total load pressure in the operating load pressure of concrete pump when determining the benchmark of target pumping stroke, the hydraulic connecting form of operating load pressure-detecting device 10 can be different.For example, when adopting total load pressure when determining the benchmark of target pumping stroke, this operating load pressure-detecting device 10 can be communicated with the first working oil path A and the second working oil path B of described concrete pump, to detect the driving oil pressure of concrete pump, and calculate and obtain total load pressure by this driving oil pressure.When adopting stock induced pressure when determining the benchmark of target pumping stroke, but this operating load pressure-detecting device 10 is communicated with the communicated cavity 5 of concrete pump, thereby detect and detect the oil pressure obtaining in communicated cavity 5, and calculate and obtain stock induced pressure with this oil pressure.When adopting suction induced pressure when determining the benchmark of target pumping stroke, described operating load pressure-detecting device 10 can comprise two oil pressure sensors, one of them oil pressure sensor is communicated with the first working oil path A and the second working oil path B respectively, another oil pressure sensor is communicated with communicated cavity 5, can calculate respectively like this total load pressure and stock induced pressure, the difference of this total load pressure and stock induced pressure is suction induced pressure.The form that specifically arranges of operating load pressure-detecting device 10 is diversified for the technician of Hydraulic Field, be not limited to the concrete situation shown in Fig. 3, in Fig. 3, be for example by the first working oil path A by oil circuit, hydraulic oil in two working oil path B and communicated cavity 5 is measured after drawing, but apparently, oil pressure sensor in operating load pressure-detecting device 10 also can directly be set in communicated cavity 5 or in the rod chamber of the first master cylinder 1 shown in Fig. 3 and the rod chamber of the second master cylinder 2, and oil pressure sensor can be electrically connected on controller 9, thereby calculated according to corresponding oil pressure by controller and determine corresponding suction induced pressure, stock induced pressure or total load pressure, certainly operating load pressure-detecting device 10 also can carry corresponding computing unit and display unit, thereby can determine and/or show required operating load pressure.
It should be noted that at this, in the present invention, operating load pressure-detecting device 10 is only the operating load pressure for detection of concrete pump, be in the detection deterministic process of its operating load pressure that is applied in concrete pump, this operating load pressure-detecting device 10 can carry corresponding computing unit and display unit, thereby according to detect corresponding oil pressure calculative determination and/or show required operating load pressure, also the computing unit with self not, and oil pressure sensor is electrically connected on controller 9, thereby calculated according to corresponding oil pressure by controller and determine corresponding suction induced pressure, stock induced pressure or total load pressure.No matter which kind of form operating load pressure-detecting device 10 belongs to, and determines the operating load pressure of concrete pump as long as it participates in detecting, within all should working as and belonging to technical conceive of the present invention.
In addition, described pumping stroke controlling device specifically can comprise the drive unit of pump suction device and this pump suction device, wherein said controller 9 is electrically connected on described drive unit, and described pump is inhaled device and is communicated with the communicated cavity 5 of described concrete pump with optionally from the interior suction of this communicated cavity 5 or to the interior injection liquid force feed of this communicated cavity 5.Apparently, it can be that pump that metering pump or other can pump imbibition force feeds is inhaled device and (is for example with graduated plunger pump that described pump is inhaled device, the drive unit that this plunger pump adopts can be for example electric expansion bar), described drive unit can be motor or the fluid motor-driven assembly with solenoid directional control valve etc., drive metering pump by drive unit, the pump such as plunger pump is inhaled the clockwise and anticlockwise of devices or flexible and realize pumping or the suction of hydraulic oil, for example adopting under the situation of metering pump, can drive metering pump positive and negative then realize pumping or suction by controlling motor, two ports of metering pump can be connected respectively to communicated cavity 5 and fuel tank, certain described pump is inhaled device also can adopt two metering pumps, metering pump is specifically designed to from aspirated liquid force feed in communicated cavity, another metering pump is specifically designed to the interior pump oil of communicated cavity 5 (two ports of each metering pump can be connected respectively to communicated cavity 5 and fuel tank), this for regulating the pumping stroke controlling device 8 of the hydraulic oil volume in the communicated cavity 5 of described concrete pump for the technician of Hydraulic Field, under the enlightenment of technical conceive of the present invention, can design multiple pattern, do not repeat them here.This pumping stroke controlling device can have various ways, comprise that at it pump is inhaled device and this pump is inhaled under the situation of drive unit of device, relevant pump is inhaled device and drive unit can carry out multiple modification for those skilled in the art especially, does not repeat them here.
Preferably, concrete pumping equipment of the present invention also comprises the displacement transducer for detection of the actual pumping stroke L of described concrete pump, this can detect current actual pumping stroke L before the pumping stroke that regulates concrete pump, thereby needn't before every subjob, all need concrete pump to be adjusted to maximum pumping stroke, and in continuous different work process, can realize easily the self adaption adjusting of pumping stroke.Described displacement transducer is general only need to be installed on the first master cylinder 1 or the second master cylinder 2, in Fig. 3, on the first piston bar 3 of the first master cylinder 1 and the second piston rod 4 of the second master cylinder 2, first piston bar displacement transducer 6 and the second piston rod displacement transducer 7 are installed simultaneously, this first piston bar displacement transducer 6 and the second piston rod displacement transducer 7 are magnetic resistance type linear displacement transducer, it generally adopts in the stroke detection of oil hydraulic cylinder, its installation form is well known to those skilled in the art, conventionally be installed as piston rod can be slided with respect to the rod-type gauge head of magnetic resistance type linear displacement transducer.Certainly, displacement transducer also can adopt other known sensor, such as Hall transducer etc.Apparently, this solidifying native pump pumping equipment for example can be for being provided with concrete mixer, the concrete pump etc. of concrete pump.
Can be found out by upper description, the invention has the advantages that: the pumping stroke controlling method and the concrete pumping equipment that the invention provides a kind of concrete pump, it can be according to concrete operating load pressure (directly related with the operating mode of suction deficiency in concrete pumping), regulate adaptively the pumping stroke of concrete pump, make concrete conveying cylinder effectively avoid the phenomenon of suction deficiency, thereby improve pumping suction efficiency, energy saving.The present invention has realized the step-less adjustment of the pumping stroke of concrete pump, especially under preferred form, the present invention preferably adopts operating load pressure-detecting device 10, has controller 9 and the pumping stroke controlling device 8 of database, realize adjusting automatically by controller 9, thereby realized the self adaption adjusting of the pumping stroke of concrete pump.Therefore, the invention enables concrete pump pumping stroke work with relative ideal under different concrete pumping operating modes, thereby reached desirable suction efficiency.Concrete pumping equipment of the present invention is simple in structure, easy to operate, with low cost, and owing to effectively having reduced the backlash of concrete piston, therefore can extend significantly the life-span of concrete piston.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.Especially, mainly the pumping stroke controlling method of twin cylinder pump of the present invention is described as an example of concrete pump example although above and for realizing the pumping equipment of the method, but the pumping stroke controlling method of twin cylinder pump of the present invention and be obviously not limited to pumping stroke controlling method and the concrete pumping equipment of concrete pump for realizing the pumping equipment of the method, but can be applicable to generality the control for delivery of the pumping stroke of the twin cylinder pump of other fluid foods, for example mud, the control of the pumping stroke of the twin cylinder pumps such as mortar, especially be formed for carrying the pumping equipment of other sticky material.
It should be noted that in addition each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between various mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (19)

1. the pumping stroke controlling method of twin cylinder pump, wherein, comprises the steps:
The first, in twin cylinder pump working procedure, detect and obtain the operating load pressure of this twin cylinder pump; The second, determine according to the operating load pressure of described twin cylinder pump the target pumping stroke that this operating load pressure is corresponding; The 3rd, by regulating the volume of the hydraulic oil holding in the communicated cavity (5) of described twin cylinder pump, and the actual pumping stroke (L) of described twin cylinder pump is adjusted to described target pumping stroke.
2. the pumping stroke controlling method of twin cylinder pump according to claim 1, wherein, in described first step, the operating load pressure of described twin cylinder pump is suction induced pressure, stock induced pressure or total load pressure.
3. the pumping stroke controlling method of twin cylinder pump according to claim 2, wherein, in described first step, the operating load pressure of described twin cylinder pump is total load pressure, by detecting driving oil pressure in the first working oil path (A) or second working oil path (B) of described twin cylinder pump to determine described total load pressure.
4. the pumping stroke controlling method of twin cylinder pump according to claim 2, wherein, in described first step, the operating load pressure of described twin cylinder pump is stock induced pressure, by detecting the interior oil pressure of described communicated cavity (5) to determine described stock induced pressure.
5. the pumping stroke controlling method of twin cylinder pump according to claim 2, wherein, in described first step, the operating load pressure of described twin cylinder pump is suction induced pressure, by detecting driving oil pressure in the first working oil path (A) or second working oil path (B) of described twin cylinder pump to determine described total load pressure, and by detecting the interior oil pressure of described communicated cavity (5) to determine described stock induced pressure, and then determine described suction induced pressure by calculating the difference of this total load pressure and described stock induced pressure.
6. the pumping stroke controlling method of twin cylinder pump according to claim 1, wherein, in described second step, determines described target pumping stroke according to detecting the described operating load pressure obtaining by Query Database or data sheet.
7. the pumping stroke controlling method of twin cylinder pump according to claim 1, wherein, in described third step, the initial described actual pumping stroke (L) of work of described twin cylinder pump is adjusted in maximum pumping stroke, makes described actual pumping stroke (L) increase to described target pumping stroke by the volume that reduces the hydraulic oil in described communicated cavity (5).
8. the pumping stroke controlling method of twin cylinder pump according to claim 1, wherein, in described third step, detect the described actual pumping stroke (L) of described twin cylinder pump, in the time that this actual pumping stroke (L) is greater than described target pumping stroke, make described actual pumping stroke (L) be reduced to described target pumping stroke by the volume that increases the hydraulic oil in described communicated cavity (5); In the time that described actual pumping stroke (L) is less than described target pumping stroke, make described actual pumping stroke (L) increase to described target pumping stroke by the volume that reduces the hydraulic oil in described communicated cavity (5).
9. the pumping stroke controlling method of twin cylinder pump according to claim 8, wherein, in described third step, regulate continuously the volume of the hydraulic oil in described communicated cavity (5), and detect in real time the actual pumping stroke (L) of described twin cylinder pump, until being adjusted to described target pumping stroke, this actual pumping stroke (L) stops regulating the volume of the hydraulic oil in described communicated cavity (5).
10. the pumping stroke controlling method of twin cylinder pump according to claim 8, wherein, in described third step, the volume of the hydraulic oil increasing in described communicated cavity (5) or reduce is that described actual pumping stroke (L) is multiplied by the sectional area of described communicated cavity (5) with the absolute value of the difference of described target pumping stroke, wherein
In the time that described communicated cavity (5) is formed by first master cylinder (1) of described twin cylinder pump and the connection of the rodless cavity of the second master cylinder (2), the sectional area of described communicated cavity (5) equals the sectional area of the rodless cavity of described the first master cylinder (1) or the second master cylinder (2); When described communicated cavity (5) is communicated with while forming by the rod chamber of described the first master cylinder (1) and the second master cylinder (2), the sectional area that the sectional area of described communicated cavity (5) equals the rod chamber of described the first master cylinder (1) or the second master cylinder (2) deducts the sectional area of the piston rod of this first master cylinder (1) or the second master cylinder (2).
The pumping stroke controlling method of 11. twin cylinder pumps according to claim 10, wherein, the pumping stroke controlling method of described twin cylinder pump also comprises the 4th step, in the 4th step, detect the actual pumping stroke after described twin cylinder pump regulates, to determine that the actual pumping stroke after this adjusting equals described target pumping stroke.
12. according to the pumping stroke controlling method of the twin cylinder pump described in any one in claim 1 to 11, wherein, in described first step, is detected and obtained the operating load pressure of described twin cylinder pump by operating load pressure-detecting device (10); In described second step, adopt controller (9) according to detecting the described operating load pressure obtaining, determine the corresponding described target pumping stroke of this operating load pressure by the database of inquiring about in this controller (9); In described third step, described controller (9) is controlled pumping stroke controlling device (8), to regulate the volume of the hydraulic oil in described communicated cavity (5) by this pumping stroke controlling device (8).
13. pumping equipments, comprise twin cylinder pump, wherein, this pumping equipment also comprises controller (9), for regulating the pumping stroke controlling device (8) of the hydraulic oil volume in the communicated cavity (5) of described twin cylinder pump and the operating load pressure-detecting device (10) for detection of the operating load pressure of described twin cylinder pump
Described controller (9) is electrically connected on described operating load pressure-detecting device (10) and described pumping stroke controlling device (8), the described operating load pressure that this controller (9) is determined according to detection is determined the target pumping stroke of the corresponding twin cylinder pump of this operating load pressure, and and then by control described pumping stroke controlling device (8) regulate the volume of the hydraulic oil holding in the communicated cavity (5) of described twin cylinder pump, thereby actual pumping stroke (L) current described twin cylinder pump is adjusted to described target pumping stroke.
14. pumping equipments according to claim 13, wherein, described operating load pressure-detecting device (10) comprises oil pressure sensor, this operating load pressure-detecting device (10) is communicated with described the first working oil path (A) and the second working oil path (B) respectively by hydraulic pipe line, and/or this operating load pressure-detecting device (10) is communicated with described communicated cavity (5) by hydraulic pipe line.
15. pumping equipments according to claim 13, wherein, described pumping stroke controlling device (8) comprises the drive unit of pump suction device and this pump suction device, described controller (9) is electrically connected on described drive unit, and described pump is inhaled device and is communicated with optionally aspirate or to the interior injection liquid force feed of this communicated cavity (5) from this communicated cavity (5) is interior with the communicated cavity (5) of described twin cylinder pump.
16. pumping equipments according to claim 15, wherein, it is metering pump that described pump is inhaled device, described drive unit is motor.
17. pumping equipments according to claim 13, wherein, described pumping equipment also comprises the displacement transducer for detection of the actual pumping stroke (L) of described twin cylinder pump.
18. pumping equipments according to claim 17, wherein, described displacement transducer is magnetic resistance type linear displacement transducer.
19. according to claim 13 to the pumping equipment described in any one in 18, and wherein, described pumping equipment is concrete pumping equipment.
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